Brush or collector for dynamo-electric machinery.



PATENTED AUG. 29, 1905.

J. H. HALLBERG. BRUSH CR COLLECTOR IOR DYNAMO ELECTRIC MACHINERY.

APPLICATION FILED EEB. 15. 1904.

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UNITED STATES PATENT OFFICE.

JOSEF HENRIK HALLBERG, OF CINCINNATI, CHIC.

BRUSH OR COLLECTOR FOR DYNAMO-ELECTRIC MACHINERY.

Specification of Letters Patent.

Patented Aug. 29, 1905.

Application filed February 15, 1904. Serial No. 193,507.

To cti/Z whom it naar] concern:

Be it known that I, JOSEF HENRIK HALL- BERG, a citizen of the UnitedStates, residing at Clifton, Cincinnati, county of Hamilton, State ofOhio, have invented certain new and useful Improvements in Brushes orCollectors for Dynamo-Electric Machinery, of which the following is aspecilication.

My invention relates to the means employed for establishing andmaintaining good electrical connection between a block or plate, whichforms a brush or collector, and a circuitterminal. The successfuloperation and efiiciency of a dynamo-electro generator or motor,especially those of large capacity, depends to a great extent upon thecharacter and resistance of the contact maintained between the brush orcollector and the circuitterminal. In practice I have found that withthe means now employed for establishing such electrical connection aloss of current of fully five per cent. occurs, which loss is graduallyincreased if such brushes or collectors are maintained in use for anyconsiderable length of time.

The object of my invention, therefore, is to provide means to originallymake a good electrical. connection between a brush or eollector and acircuit-terminal and of a character which will interpose practically noresistance in the circuit and which connection will be maintainedirrespective of any rough service to which the brush or collector may besubjected-as, for instance, when used upon a motor or any other positionwhere it.

is subjected to vibration or shocks.

The accompanying drawings will serve to illustrate my invention, and inwhich Figure 1 is a vertical section with the pressure-screw and ball inelevation. Fig. 2 is a front view. Fig. 3 is a vertical section througha terminal, collecting member, and supporting-ring with the other partsin elevation. Fig. -i is a detached elevation of a terminal before beinginserted into a collecting member. Fig. 5 is a front view of amodification. Fig. 6 is an end view of the modification shown in Fig. 5.Fig. 7 is a detached view in perspective of one of the resisting-platesshown in Fig. 5.

In the drawings, 5 indicates a collecting member, which may be made ofcarbon or other suitable collecting material and of any desired shape.Located in any suitable position in the collecting member is a cavity 6,Which may be given any suitable shape, preferably cylindrical andcone-shaped at its lower end and carried through the major portion ofthe collecting member. The exposed surface of this cavity I prefer toroughen, as indicated at 7, Fig. l, and further to cover with a depositof a conducting material, such as copper. y

8 indicates a circuit-terminal formed of a good conducting material andwhich may be rigid or iiexible, preferably iiexible. The shape of suchterminal is immaterial. Preferably, however, it is given the shape shownin Fig. Li-that is, with parallel sides and of the same width at top andbottom. It may, however, be given the shape shown at Fig. 2- that is,the top portion 9 narrower than the bottom portion 10. The bottom of theterminal I prefer to cut away to form a series of V-shaped projections11. I also prefer to give the terminal a roughened surface, as indicatedat 12. The object of making the lower edge of the bottom portion 10 withV- shaped projections is to provide means whereby such bottom portionmay be bent to take the shape ofthe bottom of tue cavity 6 in thecollecting member 5, as indicated in Fig. 2.

The bottom portion 10 of the terminal 8 before it is inserted in thecavity 6 of the collecting member 5 is turned upon itself to form acylindrical body 13, which in exterior diameter is substantially thesame as the diameter of such cavity.

Situated within the cylindrical body 13 of the terminal 8, Figs. 1', 2,and 3, is a tubular body 14, the bottom 15 of which is closed androunded, This tubular body is interiorly threaded at the top and dividedat the bottom by one or more longitudinal parallel slots 16, extendingupward. The interior of the tubular body is cone-shaped, with the apex17 of the cone at the bottom of the tube. Located within the tubularbody and bearing upon the sides of its cone-shaped interior is a ball18, and arranged over this ball is a bolt provided with a screw-threadat its upper end, which takes in a thread situated in the upper part ofthe tubular body 14 and having an extension at its lower end, whichbears upon the top of the ball. By screwing the bolt 19 downwardpressure is made through the ball upon the sides of the tube at thebottom, which forces the sides of the tube outward into contact with thebottom portion 10 of the terminal S and at the same time the outersurface of such bottom portion 10 into contact with the inner surface ofICO IIO

the cavity 6 in the collecting member 5, thus insuring a good,permanent, and separable connection between the outer surface of theterminal S and the surface of the cavity 6 in the collecting member 5.To resist the outward pressure exerted by the sides of the slotted tube14, a strap of metal 2() may be placed around the exterior of thecollecting member 5, if desired.

In the construction shown in Figs. 5 and 6 the slotted tube is omittedand'in place o'l it there is used a metal strap 21, which surrounds theupper portion of the collecting member 5 and has its ends 22 turnedinward and upward and situated in contact with metal plates 23, Fig` 7,located in cavities 24, formed in the opposite sides o1 the collectingmember 5. These plates 23 serve a double purpose: Vfirst, to 'form ahard resisting seat for the upward pressure exerted by the ends 22 ofthe strap 21, and, second, to form an extended collecting-surface -for asupplemental terminal, as will be described. The top of the strap 21 hasformed in it an opening 25, (two of such openings are shown in Fig. 5,)screw-threaded at 26 on its interior. Located within such opening 25 isa screw 27, the lower end of which is situated in a threaded opening inthe top o'l` a tapered bolt 28. This tapered bolt is situated in thecylindrical portion 13, formed in the bottom oi' the terminal 8. Byadjusting the .screw 27 downward the tapered bolt is forced downward andmaking pressure upon the cylindrical portion of the terminal S expandssuch cylindrieal portion and l'orces it into contact with the surface ofthe cavity 6 in the collecting member 5.

1n Fig. 6 l have shown a second terminal 29, connected at its lower endto the plates 23, the object of which arrangement is to increase theconducting capacity at the terminals and decrease theresistance due tothe mass of the collecting member.

It will be observed that the ends of the terminal member or members 8are carried very near to the collecting-surface of the collecting memberand, further, that owing to the shape given to the lower end of theterminal member an extended conducting-surface is presented to the bodyof the collecting member. The effect of the construction described isnot only to insure a good electrical connection, which maybe maintained,but to materially reduce the resistance of the collecting member, and,further, the respective members may be quickly separated for inspection,repair, or the substitution of a new terminal or collecting member.

The two means described for effecting and maintaining good electricalconnection between the collector-block and the terminal or terminals arethose l prefer to use but it will be obvious to any mechanic that otherdevices which serve to effect good connection by forcing the respectivemembers in contact may be substituted.

Having thus described my invention, l claim- 1. A brush or collector fordynamo-electric machinery, comprising a collecting memlier having acavity therein, a llexible terminal member having one end situated inthe cavity, and means within the cavity lor 'foreing said members intoan intimate and extended contact.

2. A brush or collector for dynamo-electric niachinery, comprising acollecting member having a cavity therein, a llexible terminal memberhaving one end situated in. the cavity, and adjustable means within thecavity for `forcing said members into an intimate and extended contact.

3. A brush or collector vfor dynamo-electric machinery, comprising acollecting member having a centrally and vertically disposed cavitytherein, a flexible terminal member having one end situated in saidcavity, and means within the cavity for 'forcing said members into anintimate and extended contact.

4. A brush or collector 'for dynamo-electric machinery, comprising acollecting member having a cylindrical vertical]y-disposed cavitytherein, a flexible terminal member having one end situated in saidcavity and shaped to conform to the sides of the cavity, and meanssituated within the cavity 'for forcing said members into an intimateand extended contact.

5. A brush or collector 'for dynamo-electric machinery, comprising acollecting member having a cavity therein, a terminal member having oneend turned to conform to the shape of said cavity, and means for'forcing said members into intimate contact.

6. A brush or collector 'for dynamo-electric machinery, comprising acollecting member having a cavity therein, open at its upper end only, aterminal member having one end situated in said cavity, and a devicealso situated in said cavity for 'forcing the collecting and terminalmembers into intimate contact.

7. A brush or collector 'for dynamo-electric machinery, comprising acollecting member having a cavity therein, a terminal :ineinber havingone end situated in said cavity, a slotted tube situated in said cavity,and means for expanding said tube at the bottom, whereby said collectingand terminal members are forced into intimate contact.

S. A brush or collector 'for dynamo-electric machinery, comprising acollecting member having a cavity therein, a terminal member having oneend situated in said cavity, a pressure member situated in said cavity,said pressure member comprising a slotted tube, cone-shaped on itsinterior, a ball located in saidinterior, and an adjustable screwsituated over said ball.

IIO

9. A brush or collector for dynamo-electric machinery, comprising acollecting member having a cavity therein, a terminal member having oneend insaid cavity, a supporting-strap surrounding the collecting member,and means for forcing the terminal member into intimate contact with thecollecting member.

10. A brush or collector for dynamo-electric machinery, comprising acollecting member, a terminal member, means for forcing the terminalmember in contact with the collecting member, a collecting-strapsurrounding the collecting member, and a supplemental terminal memberconnected to said collecting-strap.

11. A brush or collector for dynamo-electric machinery, comprising acollecting member having a cavity therein, a flexible terminal memberhaving one end situated within said cavity and shaped to conform to saidcavity, and means situated within the shaped end of the terminal memberfor establishing an extended mechanical pressure connection between saidmembers.

12. A brush or collector for dynamo-electric machinery, comprising acollecting member having a cavity therein, a flexible terminal memberhaving its lower portion shaped to conform to the interior of thecavity, and means for forcing said shaped portion of the terminal memberinto intimate contact with the surface of the cavity in the collectingmember.

13. A brush or collector for dynamo-elec tric machinery, comprising acollecting member having a cavity therein, of considerable surface areaas compared with the vertical height of the collector, a flexibleterminal member having its lower portion shaped to conform to the shapeof such cavity, and means for forcing the coacting surfaces of the twomembers into intimate contact.

14. A brush or collector for dynamo-electric machinery, comprising acollector-block having a cavity therein which extends through the majorportion of the block, a flexible ter minal having its lower end insertedin said cavity and conforming in shape and dimensions thereto, togetherwith means for forcing said portion of the terminal into intimatecontact with the body of the collector-block.

l5. A brush or collector for dynamo-electric machinery, comprising acollector-block having a cavity therein, a flexible terminal havingitslower portion situated in said cavity and conformin in shape anddimensions thereto, and meta lic means for forcing said members intointimate contact.

16. A brush or collector for dynamo-electric machinery, comprisingacollector-block having a cavity therein, a flexible terminal, and meansfor forcing the lower end of said terminal into intimate contact withthe interior surface of said cavity and near to the collecting-surfaceof said block.

In testimony whereof l affix my signature in the presence of twowitnesses.

JOSEF HENRIK HALLBERG.

Witnesses:

JOHN BROWN, H. K. PRUDDEN.

